added week 2 report

README.md

@@ -16,3 +16,4 @@ Implementation of [CRYSTALS-Kyber](https://pq-crystals.org/kyber/index.shtml) en
 ### Weekly reports
 
 * [Week 1](docs/week-1.md)
+* [Week 2](docs/week-2.md)

docs/week-2.md

@@ -0,0 +1,15 @@
+# Week 2
+
+_6. - 12.11.2023_
+
+This week I started implementing basic functionality of Kyber. I ended up writing keypair generation, encryption and decryption functions of CPAPKE section of [the official specification](https://pq-crystals.org/kyber/data/kyber-specification-round3-20210804.pdf). What I didn't implement yet is conversion between polynomial matrices and byte arrays, so ciphertext and other outputs are temporarily just numpy arrays instead of data. An example usage is included in [`main.py`](main.py) and [usage guide](docs/usage.md) is now available.
+
+* **Monday 6.11.** Started implementing keypair generation **2h**
+* **Tuesday 7.11.** Implemented encryption **2h**
+* **Thursday 9.11.** Implemented decryption. Shared secrets do not match, so there must be an error somewhere in en/decryption functions. **2h**
+* **Friday 10.11.** Found and fixed the error. Implementation is now functioning. **1h**
+* **Saturday 11.11.** Improved code quality. Added documentation, invoke tasks, code coverage and linting. **2h**
+
+Total working time 9 hours.
+
+What I discovered this week was that even the official specification is not always unequivocal. I improved at combining information – especially pseudocode – from multiple sources and debugging mathematically complex algorithm.